Which of the following statements is true about respiratory syncytial virus (RSV) infection?

The statement regarding RSV infection that is true is that it is rarely associated with bacterial co-infection. Respiratory syncytial virus is primarily known for causing upper and lower respiratory tract infections, particularly in infants and young children. While RSV can lead to significant respiratory distress, bacterial co-infections are less common. The viral nature of RSV means that secondary bacterial infections, while possible, are not the typical presentation.

Understanding the dynamics of RSV is essential for recognizing that not all respiratory illnesses following RSV are caused by bacterial pathogens; they are predominantly viral.

In contrast, the other statements are misleading. Not all RSV infections result in severe illness, as many cases are mild. RSV can affect not only infants but also children up to the age of 2, older adults, and individuals with compromised immune systems, indicating a broader demographic range. Finally, hospitalization is not required for all RSV cases; a significant number of infected individuals manage symptoms at home without needing hospital care.